瑜伽論記 6.159

6.159

他圓滿中，法教久住者，景云：如釋迦佛壽量八十，彌勒世尊住六萬歲，釋迦入涅槃後正法五百，像法一千年，彌勒涅槃之後，法住於世亦六萬歲，若住、若滅，經爾所時，正法不滅。

In 'other-perfection', regarding 'the teaching of the Dharma enduring long', Jing says: 'Just as the lifespan of Śākyamuni Buddha was eighty years, and the World-Honoured One Maitreya will remain for sixty thousand years: after Śākyamuni entered nirvāṇa, the true Dharma lasted five hundred years and the semblance Dharma one thousand years; after Maitreya enters nirvāṇa, the Dharma will abide in the world also for sixty thousand years. Whether abiding or disappearing, during that period the true Dharma does not perish.'